BND Laptop Battery [with Samsung Cells] for Acer BTP-ARJ1 BTP-AQJ1 Acer Aspire 2420 2920 3620 5540 5543 5550 5560 5590; Extensa 4120 4630; TravelMate 2420 2440 3240 3250 3280 3300 6231 6291 6292 6492